Meaning : Activities that are enjoyable or amusing.
Example :
I do it for the fun of it.
He is fun to have around.
Synonyms : merriment, playfulness
Meaning : Violent and excited activity.
Example :
She asked for money and then the fun began.
Meaning : A disposition to find (or make) causes for amusement.
Example :
Her playfulness surprised me.
He was fun to be with.
Synonyms : playfulness